分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： By including the contribution of the thermal cloud in the Lagrangian of the condensate of a Bose gas, we extend the time-dependent variational method at zero temperature to study temperature-dependent low collective excitation modes. A Gaussian trial wave function of the condensate and a static distribution density of the thermal cloud are used and analytical expressions for temperature-dependent excitation frequencies obtained. Theoretical results are compared with measurements in the JILA and MIT experiments.
分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： Phase separation of two-component untrapped and trapped Bose gases at finite temperature is studied. Conditions for the stability of a homogeneous binary Bose gas mixture at finite temperature and the density profile of the trapped binary mixture are obtained. Our extended results include the known results for zero temperature.
分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： A Bose gas in an external potential is studied by means of the local density approximation. Analytical results are derived for the thermodynamic properties of an ideal Bose gas in a generic power-law trapping potential, and their dependence on the mutual interaction of atoms in the case of a non-ideal Bose gas.
分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： A Bose gas in an external potential is studied by means of the semiclassical approximation. Analytical results are derived for the energy of an interacting Bose gas in a generic power-law trapping potential. An expression for the chemical potential below the critical temperature is also obtained. The theoretical results are in agreement with a recent energy measurement.
分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： A Bose gas in an external potential is studied by means of the semiclassical approximation. Analytical results are derived for the energy of an interacting Bose gas in a generic power-law trapping potential. An expression for the chemical potential below the critical temperature is also obtained. The theoretical results are in agreement with a recent energy measurement.
分类： 物理学 >> 凝聚态:结构、力学和热性能 提交时间： 2016-05-08
摘要： The Bose-Einstein gas in an external potential is studied by means of the local-density approximation. An analytical result is derived for the dependence ofthe critical temperature of Bose-Einstein condensation on the mutual interaction in a generic power-law potential.
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